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Batch GPU stage downloads

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This commit is contained in:
CGH0S7
2026-04-12 21:06:41 +08:00
parent 87c581ea7c
commit 7064ebd5b4
3 changed files with 94 additions and 10 deletions
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71
AMSS_NCKU_source/bssn_gpu.cu
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@@ -1103,6 +1103,77 @@ int bssn_gpu_stage_zero_buffer(const double *host_ptr, int count)
return prepare_owned_buffer(host_ptr, static_cast<size_t>(count), true) ? 0 : 1;
}
int bssn_gpu_download_buffer_batch(const int *ex, double **host_ptrs, int num_buffers)
{
if (!ex || !host_ptrs || num_buffers <= 0)
return 1;
static thread_local cudaStream_t stream = nullptr;
static thread_local cudaEvent_t ready = nullptr;
if (!stream)
{
cudaError_t err = cudaStreamCreateWithFlags(&stream, cudaStreamNonBlocking);
if (err != cudaSuccess)
{
cerr << "cudaStreamCreateWithFlags failed: " << cudaGetErrorString(err) << endl;
return 1;
}
}
if (!ready)
{
cudaError_t err = cudaEventCreateWithFlags(&ready, cudaEventDisableTiming);
if (err != cudaSuccess)
{
cerr << "cudaEventCreateWithFlags failed: " << cudaGetErrorString(err) << endl;
return 1;
}
}
cudaError_t err = cudaEventRecord(ready, 0);
if (err != cudaSuccess)
{
cerr << "cudaEventRecord download readiness failed: " << cudaGetErrorString(err) << endl;
return 1;
}
err = cudaStreamWaitEvent(stream, ready, 0);
if (err != cudaSuccess)
{
cerr << "cudaStreamWaitEvent download readiness failed: " << cudaGetErrorString(err) << endl;
return 1;
}
int n = 1;
for (int i = 0; i < 3; ++i)
n *= ex[i];
const size_t bytes = static_cast<size_t>(n) * sizeof(double);
for (int i = 0; i < num_buffers; ++i)
{
double *host_ptr = host_ptrs[i];
if (!host_ptr)
return 1;
const double *device_ptr = bssn_gpu_find_device_buffer(host_ptr);
if (!device_ptr)
return 1;
bssn_gpu_prepare_host_buffer(host_ptr, n);
err = cudaMemcpyAsync(host_ptr, device_ptr, bytes, cudaMemcpyDeviceToHost, stream);
if (err != cudaSuccess)
{
cerr << "cudaMemcpyAsync(D2H) buffered batch download failed: "
<< cudaGetErrorString(err) << endl;
return 1;
}
}
err = cudaStreamSynchronize(stream);
if (err != cudaSuccess)
{
cerr << "cudaStreamSynchronize buffered batch download failed: "
<< cudaGetErrorString(err) << endl;
return 1;
}
return 0;
}
int bssn_gpu_stage_upload_region(const double *host_ptr,
const int *full_shape,
const double *full_llb,